Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Component of Other Comprehensive Income) (Details)

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Other Comprehensive Income (Component of Other Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Foreign currency transaction and translation gain (loss) before tax $ 77 $ 45 $ (52) $ (3)
Tax (expense) benefit from foreign currency translation gain (loss) (9) (10) 13 2
Foreign currency translation adjustments, net-of-tax $ 68 $ 35 $ (39) $ (1)